ACPI: Add quirks for AMD Renoir/Lucienne CPUs to force the D3 hint

[linux-2.6-microblaze.git] / drivers / acpi / device_pm.c

diff --git a/drivers/acpi/device_pm.c b/drivers/acpi/device_pm.c
index d260bc1..6dd9bd6 100644 (file)
--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -1340,4 +1340,36 @@ int acpi_dev_pm_attach(struct device *dev, bool power_on)
        return 1;
 }
 EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
+
+/**
+ * acpi_storage_d3 - Check if D3 should be used in the suspend path
+ * @dev: Device to check
+ *
+ * Return %true if the platform firmware wants @dev to be programmed
+ * into D3hot or D3cold (if supported) in the suspend path, or %false
+ * when there is no specific preference. On some platforms, if this
+ * hint is ignored, @dev may remain unresponsive after suspending the
+ * platform as a whole.
+ *
+ * Although the property has storage in the name it actually is
+ * applied to the PCIe slot and plugging in a non-storage device the
+ * same platform restrictions will likely apply.
+ */
+bool acpi_storage_d3(struct device *dev)
+{
+       struct acpi_device *adev = ACPI_COMPANION(dev);
+       u8 val;
+
+       if (force_storage_d3())
+               return true;
+
+       if (!adev)
+               return false;
+       if (fwnode_property_read_u8(acpi_fwnode_handle(adev), "StorageD3Enable",
+                       &val))
+               return false;
+       return val == 1;
+}
+EXPORT_SYMBOL_GPL(acpi_storage_d3);
+
 #endif /* CONFIG_PM */